Photolysis of aqueous europium(III) azide complexes: formation of europium(II) induced by ligand-to-metal charge transfer excitation

2005 ◽  
Vol 8 (1) ◽  
pp. 117-118 ◽  
Author(s):  
Horst Kunkely ◽  
Arnd Vogler
Keyword(s):  
Charge Transfer ◽  
Metal Charge ◽  
Charge Transfer Excitation ◽  
Metal Charge Transfer

scholarly journals Notizen: Photoredox Reaction of [Hg(cyclam)]2+[Co(CO)4]⁻ Induced by Outer Sphere Charge Transfer Excitation

1993 ◽  
Vol 48 (3) ◽  
pp. 397-398 ◽  
Author(s):  
Horst Kunkely ◽  
Arnd Vogler
Keyword(s):  
Charge Transfer ◽  
Outer Sphere ◽  
Ion Pair ◽  
Metal Charge ◽  
Charge Transfer Excitation ◽  
Metal Charge Transfer

The ion pair [Hg(cyclam)]2+[Co(CO)4]- displays a Co(–I) to Hg(II) metal-to-metal charge transfer (MMCT) band at 288 nm. Upon MMCT excitation the ion pair undergoes a photoconversion to [HgCO2(CO)8].

Photolysis of Naphthol Green B in Aqueous Solution. Photoreduction of Fe(III) Induced by Ligand-to-Metal Charge Transfer Excitation

2003 ◽  
Vol 58 (9) ◽  
pp. 922-924 ◽  
Author(s):  
Horst Kunkely ◽  
Arnd Vogler
Keyword(s):  
Aqueous Solution ◽  
Charge Transfer ◽  
Quantum Yield ◽  
Metal Charge ◽  
Long Wavelength ◽  
Mlct Transition ◽  
Wavelength Absorption ◽  
Charge Transfer Excitation ◽  
Naphthol Green B ◽  
Metal Charge Transfer

The intense long-wavelength absorption of Naphthol Green B at λmax = 712 nm is assigned to a ligand-to-metal charge transfer (MLCT) transition. LMCT excitation of the complex in aqueous solution leads to the reduction of Fe(III) to Fe(II) with a quantum yield of ϕ = 1.14×10−3 at λirr = 577 nm.

scholarly journals Photoredox Reactions of Hg(CN)2/[Fe(CN)6]4- and [HgCo2(CN)10]6- Induced by Inner-Sphere Metal to Metal Charge Transfer Excitation

1989 ◽  
Vol 44 (2) ◽  
pp. 145-148 ◽  
Author(s):  
H. Kunkely ◽  
G. Stochel ◽  
A. Vogler
Keyword(s):  
Charge Transfer ◽  
Aqueous Mixtures ◽  
Strongly Coupled ◽  
Metal Charge ◽  
Weakly Coupled ◽  
Metal Metal ◽  
Inner Sphere ◽  
Charge Transfer Excitation ◽  
Metal Bonds ◽  
Metal Charge Transfer

Abstract Incomplexes of the type [(NC)2HgIIN CFeII(CN)5]4- which are formed in aqueous mixtures of Hg(CN)2 and [Fe(CN)6]4- both metals are weakly coupled. Optical metal to metal charge transfer (MMCT) excitation from FeII to HgIIleads to the reduction of HgII to Hg0 an the oxidation of [Fe(CN)6]4- to [Fe(CN)6]3-. In the complex [(NC)5CoI-HgII-CoI(CN)5]6- the m etals are strongly coupled by direct but polar metal metal bonds. MMCT (CoI ￫ HgII) excitation induces the photoredox reaction: [HgCo2(CN)10]6-￫Hg0 + 2[Co(CN)5]3-.

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